| 时间 | 值 | 世界排名 |
|---|---|---|
| 2015 | 3.3 | 91 |
| 2014 | 3.6 | 81 |
| 2013 | 3.9 | 83 |
| 2012 | 4.1 | 81 |
| 2011 | 4.2 | 67 |
| 2010 | 5.2 | 67 |
| 2009 | 5 | 78 |
| 2008 | 2.5 | 102 |
| 2007 | 2.9 | 100 |
| 2006 | 3 | 95 |
| 2005 | 3.1 | 76 |
| 2004 | 3.3 | 78 |
| 2003 | 4.4 | 59 |
| 2002 | 4.4 | 59 |
| 2001 | 4.3 | 49 |
| 2000 | 4.5 | 38 |
| 1999 | 4.2 | 48 |
| 1998 | 4.2 | 42 |
| 1997 | 4.4 | 34 |
| 1996 | 5 | 26 |
| 1995 | 3.9 | 38 |
| 1994 | 3.8 | 47 |
| 1993 | 4 | 42 |
| 1992 | 3.3 | 47 |